Movable Welding Jaws for Adjustable Multiple Seam Bag Sealing
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Solution Overview
Problem
Existing bag welding technologies face limitations in achieving reliable and adjustable weld seam spacing, leading to inadequate bag tightness due to product particles and variable bag material quality, resulting in potential leakage during transport and contamination.
Innovation Solution
A device with movable welding jaws that allow for the production of multiple weld seams at adjustable distances, using an ultrasonic welding method with a sonotrode and anvil, enabling variable spacing between weld seams to accommodate different bulk material types and ensuring tighter seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single weld seam is produced, then the welding process is simple and fast, but the bag tightness is insufficient due to product particles and material quality variations
Solution Approach 1:
The single weld seam is divided into multiple weld seams (first weld seam and second weld seam) spaced apart from each other. This segmentation allows the welding system to create multiple sealing lines instead of one, improving reliability by ensuring that if one weld is compromised by particles or material defects, the other welds provide additional sealing protection.
2Adaptability or versatility
If two separate sonotrodes and two anvils are used to produce spaced weld seams, then adjustable weld seam spacing is achieved, but the device complexity and manufacturing effort increase significantly
Solution Approach 1:
Two welding jaws (first welding jaw and second welding jaw) are combined into a single integrated welding device. This unified structure allows both welding jaws to be actuated simultaneously by a single sonotrode, reducing the number of separate components while still enabling the production of two spaced weld seams. The merging approach maintains adaptability through adjustable jaw positioning while avoiding the complexity of completely separate welding systems.
Solution Approach 2:
The single sonotrode and anvil assembly serves multiple functions: it can produce both the first weld seam and the second weld seam through the coordinated action of the two welding jaws. This multi-functional design eliminates the need for separate sonotrodes and anvils for each weld seam, reducing device complexity while maintaining the capability to create adjustable spaced weld seams.
3Adaptability or versatility
If the distance between two weld seams is limited to the sonotrode width (about 8 mm), then the welding device is simple, but the adaptability to different bulk material types is restricted
Solution Approach 1:
The welding device incorporates adjustable positioning mechanisms that allow the distance between the two welding jaws to be dynamically changed. This dynamic adjustability enables the system to accommodate different bulk material types by varying the weld seam spacing, with coarser materials requiring larger distances and finer materials allowing smaller distances, all within a single device configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for reliable and adjustable weld seam spacing, enhancing bag tightness and preventing leakage, even with varying material types, thereby maintaining cleanliness during transport and reducing contamination risks.
Implementation Method 1
An ultrasonic welding method has proven to be a reliable method, in which the ultrasonic hammer or the sonotrode is made to oscillate at a high frequency, as a result of which the bag valve located between the sonotrode and anvil is heated and welded.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
Device (1) and method for welding bags (4) and in particular valve bags (4) wherein a welding device (5) with two welding jaws (10, 11) is used to produce a multiple weld seam (20), wherein at least two weld seams (21, 22) are produced successively with the welding device (5) such that the weld seams (21, 22) of the multiple weld seam (20) are spaced apart. For this purpose, at least one of the welding jaws (10, 11) is movable between two spaced-apart welding positions by an adjusting device (50).